Upgrading wheels on my truck
Discussion in 'Expediter and Hot Shot Trucking Forum' started by 24kHotshot, Jan 7, 2020.
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Im not real sure what the concept is, was just answering Mitrucker’s question.
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RPM is revolutions per mile.
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Its how many times the tire turns in a mile.
If you put a chalk mark on the side of it at the edge of the tread right at the ground and rolled it one revolution so the mark is at same spot at ground and measure that. That is the circumference of tire. Your 19.5’s will do that 648 times to travel a mile.
19.5 wheel size diamater is larger than the 17’s but with your tire size overall circumference is not.
Faster tire turns per mile faster speedo reads so you can possibly be reading 65 and are actually going 63.7 hence the better mpg’s -
Check it with your phones gps app.
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I left out in my last reply that since the 19.5’s have more revs per mile than the old 17’s they are actually shorter in height than the old 17’s. Taller tires take less revs to cover a mile.
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